Refactor more code from wrapper.py into util.py

[pont-us]

Closes #40

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.42%. Comparing base (e18d348) to head (b532d6b).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
+ Coverage   89.84%   92.42%   +2.57%     
==========================================
  Files           6        6              
  Lines         591      594       +3     
  Branches       66       66              
==========================================
+ Hits          531      549      +18     
+ Misses         49       35      -14     
+ Partials       11       10       -1     

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